I've not tried Worlds Best but I switched to Oko from chick crumb as the dust/tracking of the crumb was doing my head in! Oko is also pretty bad at tracking but the pieces are slightly bigger so easier to keep on top of it. Other than the tracking it's a really good litter - clumps well, you can flush it, odour control is good and lasts absolutely ages.
I've recently trialled the Oko natures gold which is more pellet shaped and bigger than the regular Oko, it does still track (but I think all litters do) but nowhere near as bad as the regular Oko so once I've used up the last of the regular Oko I'm going to use Oko Natures gold from now on.